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AndroidActivityGroup和TabActiviy的差異性

標簽：

雜談

分類： Android技術

1)ActivityGroup

根據SDK的解釋其功能“A screen that contains and runs multiple embedded activities.”。翻譯成漢語也就是大概"<span style="word-wrap:normal; word-break:normal; line-height:normal; font-weight:normal; font-size:12px; font-family:宋體,微軟雅黑,'Lucida Grande',Geneva,Arial,Verdana,'Lucida sans Unicode',Helvetica,sans-serif; color:rgb(112,112,112); border-collapse:separate">在Android中，ActivityGroup類是Activity的容器，可以包含多個嵌套進來的Activitys".<span style="word-wrap:normal; word-break:normal; line-height:normal; font-weight:normal; font-size:12px; font-family:宋體,微軟雅黑,'Lucida Grande',Geneva,Arial,Verdana,'Lucida sans Unicode',Helvetica,sans-serif; color:rgb(112,112,112); border-collapse:separate">接下來依然采用源碼分析的方式來了解該類的內部實現。

首先，從SDK中和源碼中都可以獲知，ActivityGroup類的父類是Activity，也就是說二者具有相同的接口和生命周期，同Activity一樣，也有onCreate()、onPause()等函數可供我們重載。在ActivityGroup的源碼中有成員變量 protected LocalActivityManager mLocalActivityManager; 該變量在ActivityGroup的構造函數中創建并初始化，可見，ActivityGroup的功能實現肯定是要委托給這個對象來完成了。為了給用戶開放對此對象的訪問，ActivityGroup提供了

              
                
                  
                    public
                  
                
                
                  
                    final
                  
                
                 LocalActivityManager getLocalActivityManager
                
                  (
                
                
                  )
                
                
                  {
                
                
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>return</strong></span> mLocalActivityManager<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span></wbr></wbr>

通過瀏覽ActivityGroup的源碼可以發現，幾乎全部是以通過LocalActivityManager對象來完成的具體動作，比如：

                
                  
                    
                      protected
                    
                  
                  
                    
                      void
                    
                  
                   onCreate
                  
                    (
                  
                  Bundle savedInstanceState
                  
                    )
                  
                  
                    {
                  
                  
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>super</strong></span>.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">onCreate</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>savedInstanceState<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
        Bundle states <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> savedInstanceState <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">!=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>null</strong></span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">?</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>Bundle<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> savedInstanceState.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">getBundle</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>STATES_KEY<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">:</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>null</strong></span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
        mLocalActivityManager.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">dispatchCreate</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>states<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span></wbr></wbr></wbr></wbr></wbr>

下面，我們就來看一下LocalActivityManager的源碼。在該類中，提供了一個私有類

                
                  
                    
                      private
                    
                  
                  
                    
                      static
                    
                  
                  
                    
                      class
                    
                  
                   LocalActivityRecord 
                  
                    
                      extends
                    
                  
                   Binder 
                  
                    {
                  
                  
<wbr>
        LocalActivityRecord<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,51,153); background-color:transparent">String</span> _id, Intent _intent<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr>
            id <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> _id<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
            intent <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> _intent<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr><wbr><wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>final</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,51,153); background-color:transparent">String</span> id<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>                <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Unique name of this record.</em></span>
<wbr>
        Intent intent<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>                  <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Which activity to run here.</em></span>
<wbr>
        ActivityInfo activityInfo<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>      <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Package manager info about activity.</em></span>
<wbr>
        Activity activity<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>              <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Currently instantiated activity.</em></span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,51,153); background-color:transparent">Window</span> window<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>                  <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Activity's top-level window.</em></span>
<wbr>
        Bundle instanceState<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>           <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Last retrieved freeze state.</em></span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>int</strong></span> curState <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> RESTORED<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>        <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(102,102,102); background-color:transparent"><em>// Current state the activity is in.</em></span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

用于保存Activity的信息，并提供了

                
                  
                    
                      private
                    
                  
                  
                    
                      final
                    
                  
                   Map
                  
                    <
                  
                  String, LocalActivityRecord
                  
                    >
                  
                   mActivities
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>new</strong></span> HashMap<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&lt;</span>String, LocalActivityRecord<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&gt;</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>private</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>final</strong></span> ArrayList<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&lt;</span>LocalActivityRecord<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&gt;</span> mActivityArray
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>new</strong></span> ArrayList<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&lt;</span>LocalActivityRecord<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&gt;</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span></wbr></wbr></wbr>

采用這樣的數據結構用于對所有嵌入的子Activity信息進行保存處理。其中前者用于通過String快速查找，后者用于以數組的方式快速訪問，是典型的以空間換時間的的方式。

                
                  
                    
                      public
                    
                  
                  
                    
                      void
                    
                  
                   dispatchCreate
                  
                    (
                  
                  Bundle state
                  
                    )
                  
                  
                    {
                  
                  
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>if</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>state <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">!=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>null</strong></span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>final</strong></span> Iterator<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&lt;</span>String<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">&gt;</span> i <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> state.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">keySet</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span>.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">iterator</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>while</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>i.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">hasNext</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>try</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>final</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,51,153); background-color:transparent">String</span> id <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> i.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">next</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>final</strong></span> Bundle astate <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> state.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">getBundle</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
                    LocalActivityRecord r <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> mActivities.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">get</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>if</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>r <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">!=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>null</strong></span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr>
                        r.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">instanceState</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> astate<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>else</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr>
                        r <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>new</strong></span> LocalActivityRecord<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id, <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>null</strong></span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
                        r.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">instanceState</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> astate<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
                        mActivities.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">put</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id, r<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
                        mActivityArray.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">add</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>r<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>catch</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,51,153); background-color:transparent">Exception</span> e<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr>
……
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr><wbr><wbr>
        mCurState <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> CREATED<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

從這里我們可以看出，當有一個ActivityGroup被Create的時候，就會有對應的Activity信息被保存到數組中。

當我們調用LocalActivityManager的startActivity()以產生Window的時候，我們也可以看到

                
                  
                    
                      public
                    
                  
                  
                    Window
                  
                   startActivity
                  
                    (
                  
                  
                    String
                  
                   id, Intent intent
                  
                    )
                  
                  
                    {
                  
                  
<wbr>
                   ……
<wbr>
        LocalActivityRecord r <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> mActivities.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">get</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>if</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>r <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">==</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>null</strong></span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr>
            r <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>new</strong></span> LocalActivityRecord<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id, intent<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
            adding <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">=</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,0,102); background-color:transparent"><strong>true</strong></span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr>
                   ……
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; background-color:transparent"><strong>if</strong></span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>adding<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span> <span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">{</span>
<wbr>
            mActivities.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">put</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>id, r<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr>
            mActivityArray.<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,102,51); background-color:transparent">add</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">(</span>r<span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">)</span><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(51,153,51); background-color:transparent">;</span>
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span>
<wbr>
        ……
<wbr><span style="word-wrap:normal; word-break:normal; border:0px; padding:0px; margin:0px; color:rgb(0,153,0); background-color:transparent">}</span></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

有了這個數組，就可以遍歷到ActivityGroup中嵌入的Activitys了，從而可以實現ActivityGroup的功能。

以上的分析結果產生的類圖如下：

其核心的方面主要體現在：

Intent i = new Intent(MainActivity.this,IndexActivity.class); Window indexWindow = localManager.startActivity(INDEX_ID, i); indexDecorView = indexWindow.getDecorView();

localManager = this.getLocalActivityManager();

然后將view加進你想要用的模塊，多個view之間控制好隱藏和顯示，就可以了，用activityGroup你會被焦點的問題搞郁悶，我現在一直糾結，如何在window 之間切換，或者request到focus，有這個方面的經驗可以談下。

范例1 使用ActivityGroup來切換Activity和Layout

 在一個主界面中做Activity切換一般都會用TabActivity，使用方便，Activity互相之間相對獨立，但是可定制性不強，而且修改起來很麻煩。當然也可以把layout分開，把邏輯代碼全寫在主界面的邏輯代碼中，但是很明顯可維護性相當差，這里通過ActivityGroup來解決這個問題。
一、效果圖

　　　　要求點擊底部不同圖片按鈕切換不同的Activity，并在中間顯示Activity對應的ContentView。

　　二、實現代碼

2.1　　layout.xml

<? xmlversion="1.0"encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:layout_width ="fill_parent" android:orientation ="vertical"
android:layout_height ="fill_parent" >
 < LinearLayout android:gravity ="center_horizontal"
android:background ="@drawable/myinfor2" android:layout_width ="fill_parent"
android:layout_height ="wrap_content" >
 < TextView android:id ="@+id/cust_title" android:textColor ="@android:color/white"
android:textSize ="28sp" android:text ="模塊1" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" ></ TextView >
 </ LinearLayout >
 
 < ScrollView android:measureAllChildren ="true" android:id ="@+id/containerBody"
android:layout_weight ="1" android:layout_height ="fill_parent"
android:layout_width ="fill_parent" >
 </ ScrollView >
 < LinearLayout android:background ="@android:color/black"
android:layout_gravity ="bottom" android:orientation ="horizontal"
android:layout_width ="fill_parent" android:layout_height ="wrap_content" >
 
 < ImageView android:id ="@+id/btnModule1" android:src ="@android:drawable/ic_dialog_dialer"
android:layout_marginLeft ="7dp" android:layout_marginTop ="3dp"
android:layout_marginBottom ="3dp" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" />
 
 < ImageView android:id ="@+id/btnModule2" android:src ="@android:drawable/ic_dialog_info"
android:layout_marginLeft ="7dp" android:layout_marginTop ="3dp"
android:layout_marginBottom ="3dp" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" />
 
 < ImageView android:id ="@+id/btnModule3" android:src ="@android:drawable/ic_dialog_alert"
android:layout_marginLeft ="7dp" android:layout_marginTop ="3dp"
android:layout_marginBottom ="3dp" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" />
 </ LinearLayout >
</ LinearLayout >

2.2　　TestView.java

public class TestView extends ActivityGroup{ private ScrollViewcontainer = null ;
@Override protected void onCreate(BundlesavedInstanceState){ super .onCreate(savedInstanceState);
 // 隱藏標題欄
requestWindowFeature(Window.FEATURE_NO_TITLE); // 設置視圖
setContentView(R.layout.layout); container = (ScrollView)findViewById(R.id.containerBody); // 模塊1
ImageViewbtnModule1 = (ImageView)findViewById(R.id.btnModule1); btnModule1.setOnClickListener( new OnClickListener(){ @Override public void onClick(Viewv){ container.removeAllViews(); container.addView(getLocalActivityManager().startActivity( " Module1 " ,
 new Intent(TestView. this ,ModuleView1. class )
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) .getDecorView()); } }) // 模塊2
ImageViewbtnModule2 = (ImageView)findViewById(R.id.btnModule2); btnModule2.setOnClickListener( new OnClickListener(){ @Override public void onClick(Viewv){ container.removeAllViews(); container.addView(getLocalActivityManager().startActivity( " Module2 " ,
 new Intent(TestView. this ,ModuleView2. class )
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) .getDecorView()); } }); // 模塊3
ImageViewbtnModule3 = (ImageView)findViewById(R.id.btnModule3); btnModule3.setOnClickListener( new OnClickListener(){ @Override public void onClick(Viewv){ container.removeAllViews(); container.addView(getLocalActivityManager().startActivity( " Module3 " ,
 new Intent(TestView. this ,ModuleView3. class )
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)) .getDecorView()); } }); } }

　　　　代碼說明：

　　　　　　a).　　 ModuleView1、 ModuleView2 、 ModuleView3 分別繼承自Activity。

　　　　　　b).　　想動態改變標題可以通過cust_title獲取TextView進行設置。

注釋：想代碼實現將子activity的所用的layout加入到主activty中的layout

　　public class FormActivity extends ActivityGroup {

　　@Override

　　protected void onCreate(Bundle savedInstanceState) {

　　super.onCreate(savedInstanceState);

　　setContentView(R.layout.form);

　　LocalActivityManager m = getLocalActivityManager();

　　Intent intent = new Intent().setClass(this, ContactFieldActivity.class);

　　Window w = m.startActivity("tratat", intent);

　　View v = w.getDecorView();

　　LinearLayout container = (LinearLayout)findViewById(R.id.fieldsContainer);

　　container.addView(v);

　　}

范例2ActivityGroup + GridView 實現Tab分頁標簽

<a style="text-decoration:none; color:rgb(41,113,187)">http://blog.csdn.net/hellogv/article/details/6057174</a>

2) tabActivity

tabActivity繼承自Activity，其內部定義好了TabHost，可以通過getTabHost()獲取。TabHost 包含了兩種子元素：一些可以自由選擇的Tab 和tab對應的內容tabContentto，在Layout的<TabHost>下它們分別對應 TabWidget和FrameLayout。 <div>　　使用TabActivity可以讓同一個界面容納更多的內容。我們將按照Standup Timer里的TeamDetailsActivity來講述TabActivity的使用。在該例中，包含了兩個Tab一個用于展示team的統計信息，一個用于展示team所參加的會議的列表（這是一個ListView）。</div> <div> <h2 style="margin:0px; padding:0px; border:0px; list-style:none; color:rgb(0,0,0); line-height:1.5"> 創建Layout </h2> <div style="padding:0px; margin:0px">　　這里需要注意的是不管你是使用TabActivity 還是自定義TabHost，都要求以TabHost作為XML布局文件的根。 <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> <?xml version="1.0" encoding="utf-8"?> <TabHostxmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost"android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayoutandroid:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"> <TabWidgetandroid:id="@android:id/tabs" android:layout_width="fill_parent"android:layout_height="wrap_content"/> <FrameLayoutandroid:id="@android:id/tabcontent" android:layout_width="fill_parent"android:layout_height="fill_parent">  <TextViewandroid:id="@+id/no_team_meetings" android:textSize="18sp"android:layout_width="fill_parent" android:layout_height="fill_parent"/> <TextViewandroid:id="@+id/no_team_meeting_stats" android:textSize="18sp"android:layout_width="fill_parent" android:layout_height="fill_parent"/> </FrameLayout> </LinearLayout> </TabHost> </div> </div> </div> <div style="padding:0px; margin:0px">通常我們采用線性布局所以<TabHost> 的子元素是 <LinearLayout>。<TabWidger>對應Tab。<FrameLayout>則用于包含Tab需要展示的內容。需要注意的是<TabWidger> 和<FrameLayout>的Id 必須使用系統id，分別為android:id/tabs 和 android：id/tabcontent 。因為系統會使用者兩個id來初始化TabHost的兩個實例變量（mTabWidget 和 mTabContent）。</div> <h2 style="margin:0px; padding:0px; border:0px; list-style:none; color:rgb(0,0,0); line-height:1.5"> 編寫Java代碼</h2> <div style="padding:0px; margin:0px">　　我們可以采用兩種方法編寫標簽頁：一種是繼承TabActivity ,然后使用getTabHost()獲取TabHost對象；第二種方法是使用自定的TabHost在布局文件上<TabHost>的自定義其ID，然后通過findViewById()，方法獲得TabHost對象。</div> <div style="padding:0px; margin:0px">　　本文中采用繼承TabActivity的方法。</div> <div style="padding:0px; margin:0px"> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> privatevoidcreateTabs() { TabHost tabhost=getTabHost(); tabhost.addTab(tabhost.newTabSpec("stats_tab"). setIndicator(this.getString(R.string.stats)). setContent(createMeetingDetails(team))); tabhost.addTab(tabhost.newTabSpec("meetings_tab"). setIndicator(this.getString(R.string.meetings)). setContent(createMeetingList())); getTabHost().setCurrentTab(0); } </div> </div> Java代碼中我們首先需要做的是獲取TabHost對象，可以通過TabActivtiy里的getTabHsot（）方法。如果是自定義TabHost，在添加Tabs前應該調用<a target="_blank" style="text-decoration:none; color:rgb(41,113,187)">setUp()</a>方法。</div> <div style="padding:0px; margin:0px"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; word-wrap:break-word"></pre> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> mTabHost=(TabHost)findViewById(R.id.tabhost); mTabHost.setup(); mTabHost.addTab(TAB_TAG_1,"Hello, world!","Tab 1"); </div> </div> <pre style="white-space:normal">SDK上的原文：</pre> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; word-wrap:break-word">　　Call setup() before adding tabs if loading TabHost using findViewById().However:You do not need to call setup() after getTabHost() in<code style="padding:0px; margin:0px"><a style="text-decoration:none; color:rgb(41,113,187)">TabActivity</a></code>.</pre> 　　接著向TabHost添加tabs.即調用tabHost.addTab(TabSpec) 方法。<a target="_blank" style="text-decoration:none; color:rgb(41,113,187)">TabSpec</a>主要包含了setIndicator 和 setContent 方法，通過這兩個方法來指定Tab 和 TanContent。</div> <div style="padding:0px; margin:0px">　　TabSpec 通過.newTabSpec(String tag)來創建實例。實例化后對其屬性進行設置。setIndicator()設置tab,它有3個重載的函數 </div> <div style="padding:0px; margin:0px"> <ul style="margin:0px 0px 0px 45px; padding:0px; border:0px; list-style-position:initial"> <li style="margin:0px; padding:0px; border:0px; list-style:disc">　public TabHost.TabSpec　setIndicatior(CharSwquence label,Drawable icon).指定tab的標題和圖標。</li> <li style="margin:0px; padding:0px; border:0px; list-style:disc">public TabHost.TabSpec (View view)通過View來自定義tab</li> <li style="margin:0px; padding:0px; border:0px; list-style:disc">public TabHost.TabSpec(CharSequence label) 指定tab的標題，此時無圖標。</li> </ul> <div style="padding:0px; margin:0px">　 setContent 指定tab的展示內容，它也有3種重載 </div> </div> <div style="padding:0px; margin:0px"> <ul style="margin:0px 0px 0px 45px; padding:0px; border:0px; list-style-position:initial"> <li style="margin:0px; padding:0px; border:0px; list-style:disc">public TabHost.TabSpec setContent(TabHost.TabContentFactory )</li> <li style="margin:0px; padding:0px; border:0px; list-style:disc">public TabHost.TabSpec setContent(int ViewId)</li> <li style="margin:0px; padding:0px; border:0px; list-style:disc">public TabHost.TabSpec setContent(Intent intent)</li> </ul> <div style="padding:0px; margin:0px">　　后兩種方法比較后理解一個是通過 ViewId指定顯示的內容，如.setContent(R.id.Team_EditText)。第三種則是直接通過Intent加載一個新的Activity頁。如.setContent(new Intent(this, MeetingActivity.class)));</div> </div> <div style="padding:0px; margin:0px">　　本例中是通過<a target="_blank" style="text-decoration:none; color:rgb(41,113,187)">TabContentFactory</a>來指定對應的TabContent。<a target="_blank" style="text-decoration:none; color:rgb(41,113,187)">TabContentFactory</a>是一個接口，其只包含了一個返回 View 的createTabContent(String tag)方法。</div> <div style="padding:0px; margin:0px"> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> privateTabContentFactory createMeetingDetails(Team team2) { returnnewTabHost.TabContentFactory() { @Override publicView createTabContent(String tag) { 　　　　　　　　　　//設置View setStatsTabContent(); returnfindViewById(R.id.teamStats); } }; } privateTabHost.TabContentFactory createMeetingList() { returnnewTabHost.TabContentFactory() { @Override publicView createTabContent(String tag) { </div> <div style="padding:0px; margin:0px"> 　　　　　　 meetingListAdapter=createMeetingListAdapter(); meetingList.setAdapter(meetingListAdapter); returnmeetingList; } }; } </div> </div> <div style="padding:0px; margin:0px"></div> 事先聲明好的</div> <div style="padding:0px; margin:0px"> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> privateListView meetingList=null; privateArrayAdapter<String>meetingListAdapter=null; </div> </div> <div style="padding:0px; margin:0px">我們也可以讓TabActivity去實現TabContentFactory 接口</div> <div style="padding:0px; margin:0px"> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> publicclassTabs2extendsTabActivityimplementsTabHost.TabContentFactory </div> </div> 然后在TabActiviy類中實現createTabContent方法</div> <div style="padding:0px; margin:0px"> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <pre style="white-space:normal; padding:0px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> @Override publicView createTabContent(String tag) { finalTextView tv=newTextView(this); tv.setText("Content for tab with tag"+tag); returntv; } </div> </div> </div> setStatsTabContent();方法</div> <div style="padding:0px; margin:0px"> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <img src="http://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" name="code_img_closed_2fabc5ab-8d5e-4559-b451-8019572189d4" alt="AndroidActivityGroup和TabActiviy的差異性" title="AndroidActivityGroup和TabActiviy的差異性" style="margin:0px; padding:0px 5px 0px 0px; border:0px; list-style:none; vertical-align:middle">setStatsTabContent </div> </div> <div style="padding:0px; margin:0px">　　最后將TabSpec 添加到 TabHost上，即tabHost.addTab(tabSpec)。我們發現TabSpec 的setIndicator 和 setContent 方法返回的都是 TabSpec 自身所以可以使用竄的方式編寫代碼：</div> <div style="border:1px solid rgb(204,204,204); padding:5px; overflow:auto; font-size:12px; margin:0px; word-break:break-all; font-family:'Courier new'; background-color:rgb(245,245,245)"> <h1 style="margin:0px; padding:0px; border:0px; list-style:none; color:rgb(0,0,0); line-height:1.5"> </h1> </div> <pre style="white-space:normal; padding:0px; font-size:12px; margin-top:0px; margin-bottom:0px; font-family:'Courier new'; word-wrap:break-word"></pre> <div style="padding:0px; margin:0px"> tabhost.addTab(tabhost.newTabSpec("stats_tab") .setIndicator(this.getString(R.string.stats)) .setContent(createMeetingDetails(team))); </div> </div>

 3）兩者之間的差異性

在一個主界面中做Activity切換一般都會用TabActivity，使用方便，Activity互相之間相對獨立，但是可定制性不強，而且修改起來很麻煩。當然也可以把layout分開，把邏輯代碼全寫在主界面的邏輯代碼中，但是很明顯可維護性相當差，這里通過ActivityGroup來解決這個問題

Android ActivityGroup和TabActiviy的差異性

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Android ActivityGroup和TabActiviy的差異性

AndroidActivityGroup和TabActiviy的差異性

android

activitygroup

tabactiviy

差異性

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